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The '''Library of Congress''' is the research library that officially serves the United States Congress, but which is the ''de facto'' national library of the United States. It is the oldest federal cultural institution in the United States. The Library is housed in three buildings on Capitol Hill in Washington, D.C., and also maintains the National Audio-Visual Conservation Center|Packard Campus in Culpeper, Virginia, which houses the National Audio-Visual Conservation Center. The library is the List of largest libraries|second-largest library in the world by collection size, with the largest being the British Library. The Library's "collections are universal, not limited by subject, format, or national boundary, and include research materials from all parts of the world and in more than 450 languages. Two-thirds of the books it acquires each year are in languages...
Library nameLibrary of Congress
Library logoFile:US-LibraryOfCongress-BookLogo.svg|80px|alt=blue logo of book open to blue stripe flag page|Logo      File:US-LibraryOfCongress-Seal.svg|100px|alt=schematic round seal of eagle of the Library of Congress|Seal
LocationWashington, D.C.
Established{{start date and age|1800|4|24}}
Num branchesN/A
Collection size23,892,068 catalogued books in the Library of Congress Classification system;
Annual circulationLibrary does not publicly circulate
Pop served535 members of the United States Congress, their staff, and members of the public
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TOPIC atoz
Books 311
Science 191
History 167
Missions 158
Physics 140
Biography 135
cbk 135
Chemistry 127
Women 105
Slavery 95
Law 83
Theater 80
Art 76
Zoology 74
Birds 58
Fishes 58
Indians 56
Botany 47
Bible 40
Actors 38
Maps 37
Music 35
Culture 34
Finance 34
Ethics 27
Jews 27
Hunting 26
Animals 24
Mediums 24
Slaves 24
Artists 23
Shakers 23
Cookery 22
Comedy 21
Insects 20
Mayas 20
Prisons 20
music 20
Satire 18
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